We put Disco in a private paddock for the winter because he can't chew
hay and so needs his mash three times a day. He also needs access to a
stall in the cold weather.
Before we pulled him out of the herd this fall he was starting to get
bitten up a bit by a few of the younger mares. Before this year he has
always managed to get along quite well in the herd: I suspect that his
deafness was causing him to miss some cues.
He'll have some grass to gnaw on in the pony pen (he can't really chew
it) and he'll have Fred our retired stallion next door for company.
I think a deaf horse will be much easier to manage than a blind one
(something I've done several times).